Air-pump.



m N A; A W v m i r m 1 .1 E

H AIB PUMP. APPLICATION FILED OOT. $0, 1 91 1 RENEWED JULY 31, 1912.1,055,004.

15. H. WALKER.

f WITNESSL;

P. H. WALKER.

AIR PUMP. APPLICATION FILED 001'. so, 1911. nnnnwnn JULY 31, 1912.

1 ,O55,004. I Patented Mar. 4, 1913.

2 sums-sum 2.

WITNESSES IN VEN TOR .3 A llomexy UNITED STACMENT "OFFICE Frank E.WALKER, or mourn, nmrana.

sin-rm.

Specification of Letters Patent.

Patented Mar. 4, 1913.

Application filed October 80, 1911, Serial No. 657,468. Renewed July 81,1912. Serial Ho. 712,521.

To all whom. it may concern Be it known that I, FRANK H. WALKER, acitizen of the United States, residing at Laporte, in the county ofLaporte and State of Indiana, have invented certain new and usefulImprovements in Air-Pumps, of

p which the following is a specification.

This invention relates to that class of air pumps which are operated bythe explosion pressure of an internal-combustion engine by exposing thepump plunger to such pressure; and it is the ob ect of the invention toprovide a novel and improved structure, the

pump cylinder bein formed directly in the cylinder head of t 0 engine,thereby dispensing with all outside connections and greatly simplifyingthe structure.

A further object of the invention is to pro 1 vide an improvedlubricating system whereby the lubricate The invention also has. for itsobject to provide a novel construction-and arrangement of parts to behereinafter described dpump plunger is automatically and claimed.

In order that the invention may be better understood, reference is hadto the accompan g drawings in which- Fi igiire 1 is an end view of thecylinder of an internal combustion' engine showing the cylinder headequipped with the air pump to be hereinafter described. Figs. 2, 3 and 4are sectional views on the lines 2-2, 33 and 4-4, respectively, of Fig.1.' Figs. 5 and 6 are sectional vlews showing modified structures.

Referring specifically-to the drawing, 10 denotes a fragment of thecylinder of an in-.

terna'l-combustion'en'gine. The, engine, per 80, forms no part of thepresent invention,

- and a detaileddescriptiomor a further illusouter face, so that theinner end of said, bore opens into the-explosion chamber 14 of theengine cylinder. '--The outer end of the bore isenlargedin'diameterasindicated at 15 and forms a pm chamber which isclosed-by ahead 16,- the pum chamber .15 is located a floating plunger-1one side of which is a the implosion pressure in the chamber 14. Thehead 16 When the engine is running and compres sion takes place in thechamber 14, a res sure is placed on the plun r 17 where y it is forcedoutwardly until t e air in front of 1t 1s compressed to a'pressure equalto the compression pressure in the chamber 14.

When the explosion occurs in the chamber. 14, it exerts agreater forceon the plunger,

thereby causin it to travel to the end of the chamber 15, w ereby theairin said chamber, in front. of the Inn r, is forced out through thevalve 19 mto t e reservoir. Air

is forced into the reservoir as long as the sion pressure. on the intakestroke of the pressure therein remains below the exploengine piston 11,the suction draws the pump plunger inwardly a char of air drawn inbehind the same th rough the valve 18. As compression and explosionoccur, this air will be forced into the tank as "already described.Thus, on each explosion stroke, a small amount of air is forced into thereservoir,'to be used for starting the engine, inflating tires,operating air brakes, etc.

In order that the pump may work well, the chamber 15 must be large andunobstructed sothat the slightest change of pressure in the chamber 14will make itself noticed on the pump plunger. If there is no pressure inthe reservoir, the pump plunger will be forced to the limit of itsoutward stroke by the initial compression, and if there is a pressure inthe reservoir, the compression forces .the' pump plunger the ater partof its stroke, whic om bem shot forward the full len h of its stroke ythe explosion pressure, tereby preventing a knock on the head 16. The

prevents it inner end of the bore 13 which forms a port a leading fromthe chamber 14 to the chamber 15, must also be of lar area, as otherwisethe explosion occurs be ore the compression pressure has scheme to acton the pump plunger.

the pump plunger 17,' there is formed a lubricant reservoir 20 in thecylinder head which ex 12, saidreservoin a tends transversely in: cyha f-'In order to provide for the lubrication of i f neath the pump chamber15. Above the pump chamber, the wall thereof is formed with a duct 21which opens at one end into a duct 22 in the head 16, and at its otherend into the pump chamber, the last-mentioned end being provided with aneedle valve 23 to control the flow of lubricant into the pump chamber.The duct 22 extends ver-. tically through the head 16 between the valves18 and 19, and at its lower end it is in communication with a duct 24 inthe cylinder head 12 which latter duct leads into the bottom of thereservoir 20. The upper end of the duct 22 is of enlarged diameter whichforms a valve seat in said duct, said valve seat being engageable by aball valve 25. The reservoir is provided with a drain opening which isclosed by a screw plug 26, and to one end of the reservoir is connecteda filling tube 27.

The lubricator operates as follows: The plunger 17 passes the outlet endof the duct 21 at the end of each stroke, so that a slight suction isproduced there ateach suction stroke. This causes the lubricant to bedrawn up from the reservoir 20, and to be discharged on the side of theplunger to lubricate the same. The valve 25 acts as a check to preventthe lubricant being forced back during the compression and explosion.

Referring to Fig. 5 of the drawing, there is shown a fragment of thecylinder 28 of an internal-combustion engine, the head 29 of which'isformed with a pump chamber 30 opening at one end through a contractedportion 31 into the explosion chamber of the engine. Over the other endof the pump chamber is mounted a cylinder 32 which forms a' second pumpchamber and is in communication with the chamber 30. The outer end ofthe cylinder 32 is closed by a head 33 having air inlet'and outletvalves 34.- and 35, respectively. In the chamber 30 works a plunger 36.which'is connected by a stem 37 to a plunger 38 working in the cylinder32, the diameter of the latter being less than that of the chamber 3Q.In the wall of the cylinder 32 is an air inlet port .ner as on the valve40 closes,

39 which opens into the space between the plungers 36 and 38, and has avalve 40 which opens to admit air and closes to prevent the escapethereof. The reduced rtion 31 of V a shoulfizr4l which limits the inwardstroke of the plunger 36. In operation, the compression and explo: sionact on the plunger 36 in the same manplunger 17 already dwcribed,whereby the plunger 38 is actuated to compress the air in the cylinder32 in an obvious m'anner. On the outward stroke, the

plunger 36 is therefore compressed, so that it will tend to start theplunger on its return stroke; This is desirable in high speed work asthe suction of engine need not and the air ahead of th removing thecylinder 32, said valve can be,

removed through the chamber 30, the crosssectional area of the latterbeing such that the valve may readily pass therethrough.

' I claim:

1. The combination of an internal-combustion engine having its cylinderhead formed with a pump chamber and a port leading from one end of saidchamber to the explosion chamber ofthe engine, a closure for the otherend of the pump chamber, inlet and outlet valves carried by saidclosure, and a plunger in the pump chamber.

2.- The combination of an internal-combustion engine having a pumpchamber integral with the cylinder head of the engine and opening intothe explosion chamber thereo inlet and outlets for the pump chamber, anda pump chamber.

3. The combination of an internal-combustion engineihaving a pumpchamber. integral with the "cylinder head of the engine and o ening intothe explosion chamber thereo and said cylinder head having a lubricantreservoir and a duct leading from said reservoir into the pump chamber,inlet and outlets for the pump chamber, and a plunger worln'ng in thepump chamber and uncovering the outlet end of the aforesaid duct at theends of its stroke.

.4. The combination of an internal-combustion engine having its cylinderhead formed with a lubricant reservoir and a pump chamber, and a portleading from one end of said chamberto the explosion chamber of theengine, and said cylinder head plunger working in the havinga ductopening into the pump chamber, a head closing the pump chamber, saidhead having a duct which communicates at one of its ends with thelubricant reservoir, and at its other end with the first-mentioned duct,inlet and outlet valves carried by the head of the pump chamber, and aplunger working in the pump chamber and uncovering the outlet end of thefirst-mentioned duct at the ends of its stroke.

5. The combination of an internal-combustion engine, apumphaving" itsplunger exposed on one side totheexplosmn and compression of the engine,and an air cushion on the other side of the plunger to produce thereturn stroke thereof.

v 6. The combination of an internal-combustion engine, a pump chambercommuni-' eating at one'of its ends with I the explosion chamber of theengine,

a cylinder connected to the other end of the pump chamber, inlet andoutlet valves connected .to the cylinder,

connected plunger-s working in the pump chamber and the cylinder, and anair cushion v between the plungers.

v 7. The combination of aninternahcombustion engine, a pum chambercommunicati v at one of its on s with the explosion cham er of theengine, a cylinder connected to the other end of the ump chamber, thediameter of said cylind er being less than that of'the pump chamber,inlet and outlet valves connected to the cylinder, connected plungersworkin in the pump chamber and the cylinder, an a valve for admittingair into the space between the plungers.

. V a 8. The combination of an internal-combnstion engine having itscylinder head formed with a pump chamber which communicates with theexplosion chamber of the engine, a valve, said pump chamber being inline with the valve, and having an area which permits said valve-$0 passtherethrough, and a removable closure for the pump chamber,

In testlmonywhereof I aflix my signature MATE G. LINE, Len L. Gemini.

